/**
 * Beijing Sankuai Online Technology Co.,Ltd (Meituan)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 **/

@import Foundation;

/**
 A value object that defines empty.
 @discusstion EZRNode supports nil, so we needs EZREmpty to represent empty semantically
 Assigning the EZREmpty object to a node will stop data transmission to downstream nodes
 */
@interface EZREmpty : NSObject

/**
 Returns an instance to represent empty value.

 @return    instance of the sentry object
 */
+ (instancetype)empty;

@end
